Epson R-D1x has a Leica M lens mount and currently there are 83 native lenses available for this mount.
The latest released lenses that are compatible with the R-D1x are the Leica M 35mm f1.2, the Thypoch 21mm f3.5 and the Thypoch 21mm F1.4 M.
Epson R-D1x doesn't have a sensor based image stabilization system but
0 of these lenses already comes with optical image stabilization.
Since Epson R-D1x has a APS-C sensor, it has a focal length multiplier of 1.5× so you have to multiply lenses original focal length with this multiplier to find the Full Frame equivalent focal length of the lens when mounted on R-D1x.
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Epson R-D1x Lenses with Image Stabilization
Epson R-D1x Lenses with Weather Sealings